Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium

The goal of the study is to extract tannin from the bark of camphor tree (Dryobalanops aromatica) and to study the corrosion inhibition potential of the tannin extracts on mild steel in 0.5 M HCl. The extraction was carried out through maceration, gave percentage yield in the order of methanol extra...

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Main Author:	Akuben, Yakubu Saraya
Format:	Thesis
Language:	English
Published:	2021
Subjects:	QD1-999 Chemistry
Online Access:	http://eprints.usm.my/53006/1/YAKUBU%20SARAYA%20AKUBEN.pdf
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id	my-usm-ep.53006
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spelling	my-usm-ep.530062022-06-23T01:40:11Z Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium 2021-03 Akuben, Yakubu Saraya QD1-999 Chemistry The goal of the study is to extract tannin from the bark of camphor tree (Dryobalanops aromatica) and to study the corrosion inhibition potential of the tannin extracts on mild steel in 0.5 M HCl. The extraction was carried out through maceration, gave percentage yield in the order of methanol extract > water extract > ethyl acetate extract > hexane extract. The tannin methanol extract (TME) and tannin water extract (TWE) further characterized qualitatively and quantitatively. The Fourier transformed infrared spectroscopy (FTIR) spectra for both extracts revealed the presence of functional groups that characterise good corrosion inhibitor. The carbon-13 nuclear magnetic resonance (13C NMR) showed that both TME and TWE contain carbon-13 signals for procyanidin tannin. The total phenolic content (TPC) carried out by Folin-Ciocalteau method, total flavonoid content (TFC) by aluminium chloride colorimetric method, total tannin content (TTC) assay by Stiasny method were found to be higher in TME than TWE. The antioxidant assays revealed that TME has more reducing and antiradical power than TWE. The results from the corrosion inhibition studies conducted via electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PD) and electrochemical noise (EN) techniques showed that, inhibition efficiencies (IE) of TME and TWE increased with concentration up to 1000 ppm and the IE from the three different techniques were within the range of 80 - 93 % for TME and 80 - 92 % for TWE. All the experimental data for both tannin extracts fitted best into the Langmuir adsorption isotherm and physisorption mechanism described the inhibition process. 2021-03 Thesis http://eprints.usm.my/53006/ http://eprints.usm.my/53006/1/YAKUBU%20SARAYA%20AKUBEN.pdf application/pdf en public phd doctoral Perpustakaan Hamzah Sendut Pusat Pengajian Sains Kimia
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QD1-999 Chemistry
spellingShingle	QD1-999 Chemistry Akuben, Yakubu Saraya Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium
description	The goal of the study is to extract tannin from the bark of camphor tree (Dryobalanops aromatica) and to study the corrosion inhibition potential of the tannin extracts on mild steel in 0.5 M HCl. The extraction was carried out through maceration, gave percentage yield in the order of methanol extract > water extract > ethyl acetate extract > hexane extract. The tannin methanol extract (TME) and tannin water extract (TWE) further characterized qualitatively and quantitatively. The Fourier transformed infrared spectroscopy (FTIR) spectra for both extracts revealed the presence of functional groups that characterise good corrosion inhibitor. The carbon-13 nuclear magnetic resonance (13C NMR) showed that both TME and TWE contain carbon-13 signals for procyanidin tannin. The total phenolic content (TPC) carried out by Folin-Ciocalteau method, total flavonoid content (TFC) by aluminium chloride colorimetric method, total tannin content (TTC) assay by Stiasny method were found to be higher in TME than TWE. The antioxidant assays revealed that TME has more reducing and antiradical power than TWE. The results from the corrosion inhibition studies conducted via electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PD) and electrochemical noise (EN) techniques showed that, inhibition efficiencies (IE) of TME and TWE increased with concentration up to 1000 ppm and the IE from the three different techniques were within the range of 80 - 93 % for TME and 80 - 92 % for TWE. All the experimental data for both tannin extracts fitted best into the Langmuir adsorption isotherm and physisorption mechanism described the inhibition process.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Akuben, Yakubu Saraya
author_facet	Akuben, Yakubu Saraya
author_sort	Akuben, Yakubu Saraya
title	Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium
title_short	Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium
title_full	Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium
title_fullStr	Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium
title_full_unstemmed	Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium
title_sort	camphor tree (dryobalanops aromatica) bark extract as corrosion inhibitor for mild steel in acidic medium
granting_institution	Perpustakaan Hamzah Sendut
granting_department	Pusat Pengajian Sains Kimia
publishDate	2021
url	http://eprints.usm.my/53006/1/YAKUBU%20SARAYA%20AKUBEN.pdf
_version_	1747822216015249408

Camphor Tree (Dryobalanops Aromatica) Bark Extract As Corrosion Inhibitor For Mild Steel In Acidic Medium

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